Questions and Verified Answers
| Already Graded A+
Positive Predictive Value (PPV) - 🧠ANSWER ✔✔The probability that a
patient with a positive test result really does have the disease.
=A / A + B
Negative Predictive Value (NPV) - 🧠ANSWER ✔✔The probability that a
patient with a negative test result really is free if disease.
D/D+C
, Sensitivity - 🧠ANSWER ✔✔The ability of a test to detect disease when
disease is present.
A/A+C
Specificity - 🧠ANSWER ✔✔The ability of a test to correctly identify a
normal result.
D/D+B
Accuracy - 🧠ANSWER ✔✔The overall percentage of correct results. The
degree of "closeness" to something to its actual value.
A+D/A+B+C+D
True Positive - 🧠ANSWER ✔✔The number of tests that say disease is
present and the gold standard agrees.
A
True Negative - 🧠ANSWER ✔✔The number of tests that say disease is not
present that the gold standard agrees with.
D
False Positive - 🧠ANSWER ✔✔The number of tests that say disease is
present but negative by the gold standard.